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A valuable feature for any aftermarket EFI system is the ability to run in closed loop, which means the mixture (air/fuel ratio) is monitored continuously, and the processor makes continuous minor adjustments to the injectors to keep the ratio in the targeted zone. A wide-band Lambda sensor creates a signal that corresponds to the air/fuel ratio at any instant. EFI can also be run in Alpha-Numeric mode, which means closed-loop, where the fuel delivery at the injector is strictly controlled by pre-programmed fuel maps. Street or street/strip performance cars really benefit from closed loop capabilities. View Related Article
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